There are two ways to cancel a make up lesson.
To cancel a make up lesson from the family you need to go into the "Student Information" screen and scroll down to "Attendance". Here you will be able to see the make up. Click on the "Attendance" button next to the make up date you wish to cancel.
Here you can select your reasoning as to why the make up is being cancelled. If you allow customers to re-book make ups or you need to rebook the make up for your own reasoning you can select an a non attendance reason with (Make up) in brackets. This will ensure the customer gets that make up allocated back to them. If you select a reason with ( / ) the customer will not have another make up owing.
You can also mark a make up through the attendance screen. See image below.